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PHYSICS Questions > P5 Forces > Flashcards

P5 Forces Flashcards

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1
Q

A value with magnitude only is a ________?

A

scalar

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2
Q

A value with magnitude and direction is a ____________?

A

vector

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3
Q

Distance an speed are examples of _________ quantities

A

scalar

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4
Q

Force, displacement and velocity are examples of __________ quantities

A

vector

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5
Q

What is a contact force?

A

A force between two object which are touching

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6
Q

What is a non-contact force?

A

A force between objects which are separated by space.

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7
Q

Give two examples of contact forces

A

e.g. friction, air resistance

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8
Q

List three non-contact forces

A

gravitational, electrostatic, magnetic

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9
Q

Define weight

A

The force ofgravity acting on an object’s mass

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10
Q

What device is used to measure weight?

A

A newtonmeter

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11
Q

What is the name of the single point at which an object’s mass appears to act?

A

centre of mass

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12
Q

The center of mas of an object is…

A

the single point at which the objects weight appears to act.

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13
Q

The single force which has the same effect as the combination of all the different forces acting on an object is the ______________ _______________.

A

resultant force

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14
Q

Work is done when an object is ….

A

… moved through a distance

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15
Q

Moving objects with mass are said to have __________?

A

momentum

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16
Q

State the law of conservation of momentum

A

In a closed system the total momentum before an event is equal to the total momentum after an event.

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17
Q

State the equation which links gravitaional field strength, mass and weight

A

W=mg

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18
Q

State the equation which links distance, force and work done

A

W=Fs

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19
Q

State the equation which links extension, force and spring constant

A

F=ke

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20
Q

State the equation which links distance, speed and time

A

s=vt

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21
Q

State the equation which links acceleration, change in velocity and time taken

A

a=Δv/t

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22
Q

State the equation which links acceleration, mass and resultant force

A

F = ma

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23
Q

State the equation which links mass, momentum and velocity

A

ρ = mv

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24
Q

What is the unit of weight?

A

Newtons (N)

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25
Q

What is the unit of mass?

A

kilograms (kg)

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26
Q

What is unit of gravitational field strength?

A

newtons per kilogram (N/kg)

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27
Q

What is the unit of work done?

A

Joules (J)

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28
Q

What is the unit of force?

A

Newtons (N)

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29
Q

What is the unit of distance?

A

meters (m)

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30
Q

What is the unit of the spring constant?

A

Newtons per meter (N/m)

31
Q

What is the unit of the spring extension?

A

Metres (m)

32
Q

What is the unit of speed or velocity?

A

metres per secons (m/s)

33
Q

What are the units of acceleration?

A

metres per second squared (m/s^2)

34
Q

What are the units of momentum?

A

kilogram metres per second (kg m/s)

35
Q

When a spring is stretched and can then return to its original length it is known as __________ _______________

A

elastic deformation or elastic behaviour

36
Q

When a spring is stretched and its length is permanently altered it is known as ___________ ____________

A

Inelastic deformation or inelastic behaviour

37
Q

The limit of proportionallity of a spring is…

A

the length a spring can be stretched to before it no longer returns to its original length

38
Q

The stopping distance of a vehicle is the sum of the …..

A

thinking and breaking distances

39
Q

The distance a vehicle travels while the driver is reacting is the …

A

thinking distance

40
Q

The distance a vehicle travels which the driver is breaking is the …

A

breaking distance

41
Q

Reaction time is…

A

the time it takes a driver to react

42
Q

A typical reaction time is …

A

0.2-0.9 s

43
Q

Factors which influence reaction time are…

A

tiredness, drug, alcohol, distractions

44
Q

Factors which affect breaking distance are …

A

weather conditions, conditions of breaks and tyres

45
Q

Both thinking and breaking distance are affected by which factor?

A

speed of vehicle

46
Q

The greater the speed of a vehicle, the _________ the force required to stop the vehicle

A

greater

47
Q

The distance and object moves and the direction in which it moves is known as the _________

A

displacement

48
Q

The speed of an object in a particular direction is its ___________

A

velocity

49
Q

The change of an objects speed in a given time is the _________

A

acceleration

50
Q

Acceleration of falling objects close to the earth is ________

A

9.8 m/s2

51
Q

When the force moving an object is balanced by frictional forces it is moving at its _____________ _____________

A

terminal velocity

52
Q

On a distance time graph a straight line represents…

A

constant speed

53
Q

On a distance time graph a upward curve represents…

A

acceleration

54
Q

On a distance time graph a curved line becoming horizontal represents…

A

decelleration

55
Q

On a distance time graph a horizontal line represents…

A

stationary

56
Q

On a distance time graph the gradient is used to calculate the …

A

speed or velocity

57
Q

On a velocity time graph an upwards straight line represents …

A

acceleration

58
Q

On a velocity time graph a downwards straight line represents …

A

decelleration

59
Q

On a velocity time graph a horizontal line represents …

A

constant speed

60
Q

On a velocity time graph a horizontal line along the x-axis represents…

A

stationary object

61
Q

On a velocity time graph, when the line falls below the x-axis it indicates that the object is …

A

moving backwards

62
Q

Calcuating the gradient of a velocity time graph gives the …

A

acceleration

63
Q

Calculating the area under a velocity time graph gives the …

A

distance travelled

64
Q

A typical walking speed is …

A

1.5 m/s

65
Q

A typical running speed is …

A

3 m/s

66
Q

A typical cycling speed is …

A

6 m/s

67
Q

Sound in air travels at …

A

330 m/s

68
Q

State Newton’s First Law

A

The velocity of an object will only change if a resultant force is acting on the object.

69
Q

If balanced forces act on a moving object it will …

A

continue to travel at a constant speed

70
Q

If balanced forces act on a stationary object it will …

A

remain stationary

71
Q

State Newton’s Second Law

A

Force = mass x acceleration (The acceleration of an object is proportional to the resultant force acting on the object, and inversley proportional to the mass of the object)

72
Q

State Newton’s Third Law

A

Whenever two objects interact, the forces they exert on each other are equal and opposite

73
Q

The tendency of objects to continue in their state of rest or of uniform motion is known as …

A

inertia

PHYSICS Questions (7 decks)

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